The role of butylbenzene carbenium ions in acid catalyzed cracking of polystyrene. Transformation of n-butylbenzene, sec-butylbenzene, iso-butylbenzene, tert-butylbenzene, 4-phenyl-1-butene, n-propylbenzene and n-hexylbenzene over silicaalumina and alumina acid catalysts
Marek Marczewski , Magdalena Kominiak , Magdalena Dul , Hanna Marczewska
AbstractThe obtained results show that styrene dimers, which are the primary transition products of PS cracking undergo consecutive reactions over acid centers of high acid strength (SiO2–Al2O3(45 %); −10.8 < HO ≤ −7.9) as well as centers of low acid strength (γ-Al2O3; HO > −3.3) at sufficiently high reaction temperatures (723–773 K). It is proposed that phenylbutenyl carbenium ion obtained due to dealkylation reaction converts into coke by the successive elimination of H+ and H− ions, which in turn take part in hydrogen transfer reactions resulting in the hydrogenation of styrene dimers to diphenylbutane. The dealkylation of this compound leads to active γ-butylbenzene carbenium ion which is a key intermediate for the formation of indane and naphthalene derivatives.
|Journal series||Reaction Kinetics Mechanisms and Catalysis, ISSN 1878-5190|
|Publication size in sheets||0.65|
|Keywords in English||polystyrene decomposition, butylbenzenes reactions, acid strength, silicaalumina, alumina|
|Score|| = 15.0, 02-02-2020, ArticleFromJournal|
= 15.0, 02-02-2020, ArticleFromJournal
|Publication indicators||= 1; = 0; : 2016 = 0.617; : 2016 = 1.264 (2) - 2016=1.143 (5)|
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